JPH0932017A - Blocking fixture for lift-up hole in a manhole cover - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a blocking fixture for blocking a lift-up hole in a manhole cover. SOLUTION: A flange 11 is provided to the upper end of a shaft member 10 which can be inserted in a circular bore 3 of a lift-up hole 2 formed in a manhole cover. A protrusion 12 which can be inserted in a groove 4 the lift-up hole 2 is formed on the upper part of the outer periphery of the shaft member 10. A clamping piece 24 which can be inserted in the lift-up hole 2 is threadedly engaged with a thread part 23 formed in the lower part of a manipulating shaft 14 laid on the center axis of the shaft member 10. The shaft member 10 is provided at its lower end with a stopper piece 26 for checking rotation between a position where the opposite end parts of the clamping piece 24 is located below the protrusion 12, and at a position which is turned by an angle of 90deg. from the former position. After the clamping piece 24 and the shaft member 10 are inserted in the lift-up hole 2, and the clamping piece 24 is turned by angle of 90deg. by rotating the manipulating shaft 14 so as to be moved upward. Therefore, the manhole cover is held between the clamping piece 24 and the flange 11, and a blocking fixture is attached to the manhole cover while the lift-up hole 2 is blocked by the flange 11.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an obturator for a suspension hole in a manhole cover.

[0002]

2. Description of the Related Art Generally, a manhole cover has a weight of several tens of kilograms and is fitted into a manhole almost exactly, so that opening / closing operation is extremely difficult.

Therefore, a hanging hole is provided in the manhole cover,
The manhole cover is opened and closed using the hanging hole.

[0004]

By the way, since the hanging hole provided in the manhole cover is always open, there is a risk that the manhole cover is opened and closed by mistake.

An object of the present invention is to provide an obturator capable of opening a hanging hole of a manhole cover only when necessary.

[0006]

In order to solve the above-mentioned problems, in the present invention, the hanging hole provided in the manhole cover has a circular hole and a pair of grooves provided opposite to the inner circumference thereof. In the obturator for closing the suspension hole, a flange having a size capable of covering the suspension hole is provided on the upper end of the shaft body that can be inserted into the circular hole, and the engagement is provided on the upper peripheral portion of the shaft body. A protrusion that can be inserted into the groove is provided, and the operation shaft is rotatably supported by inserting the operation shaft into the insertion hole provided on the central axis of the shaft body, and the rotary operation tool is provided at the upper end located in the insertion hole of the operation shaft. Is provided with a torque engaging portion, a screw is provided on the outer periphery of the lower end portion projecting downward from the lower surface of the shaft body of the operating shaft, and a clamping piece insertable into the hanging hole is screw-engaged with this screw. , The position on the lower surface of the shaft body where both ends of the sandwiching piece face below the protruding part, and Setting angle provided stopper piece which detent the holding pieces in a rotating and thereby position is to that adopted the configuration of attaching the cap detachably on an upper portion of the insertion hole.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below.

As shown in FIGS. 3 (I) and 3 (II), the hanging hole 2 formed in the manhole cover 1 has a structure in which a groove 4 is provided at a position facing the inner circumference of the circular hole 3.

1 and 2 show an obturator for obstructing the suspension hole 2. The obturator A has a shaft body 10 that can be inserted into the circular hole 3 of the suspension hole 2, and a flange 11 having a size capable of covering the entire suspension hole 2 is provided at the upper end of the shaft body 10. Has been.

Further, a suspension hole 2 is provided on the outer peripheral upper portion of the shaft body 10.
A pair of protrusions 12 that can be inserted into the grooves 4 are provided. An insertion hole 13 is formed on the central axis of the shaft body 10. The upper portion of the insertion hole 13 is a stepped hole having a large diameter, and the operation shaft 14 is inserted into the insertion hole 13.

The operating shaft 14 has a head portion 15 at its upper portion, and the head portion 15 is supported by the step portion 16 of the insertion hole 13.
A retaining ring 17 is attached to the operation shaft 14, and the retaining shaft 17 and the step portion 16 prevent the operation shaft 14 from coming off.

The operating shaft 14 is rotated by a rotary operating tool 18. The rotation operation shaft 18 has a handle 20 attached to one end of a handle shaft 19 that can be inserted into the insertion hole 13, and a pair of engagement pieces 21 provided at the other end of the handle shaft 19. The head 15 of the operation shaft 14 that is rotated by the rotation operation tool 18 is provided with a torque engagement portion 22 with which the engagement piece 21 can be engaged.

The lower portion of the operating shaft 14 extends downward from the lower surface of the shaft body 10, and a screw 23 is provided on the outer periphery of the lower portion.
A sandwiching piece 24 is screw-engaged with the screw 23. The sandwiching piece 24 is movable between a flange 25 provided below the operation shaft 14 and the lower surface of the shaft body 10.

The holding piece 24 can be inserted into the hanging hole 2, and both ends of the holding piece 24 project outward from the outer diameter surface of the shaft body 10.

On the lower surface of the shaft body 10, there is provided a pair of stopper pieces 26 for preventing rotation between a position where both ends of the holding piece 24 face below the protruding portion 12 and a position rotated from the position by a set angle. It is provided.

Here, the set angle means an angle at which both ends of the sandwiching piece 24 are slightly deviated in the circumferential direction from the position facing the lower part of the projecting portion 12, and in the embodiment, the set angle is 90 °.

One side of each stopper piece 26 is a straight line parallel to the axis of the shaft body 10, and the other side is provided with a straight line portion 27b at the lower end of an inclined cam edge 27a for guiding the downward movement of the holding piece 24. There is. The inclined cam edge 27a is formed as necessary,
It may be omitted.

Reference numeral 28 shown in FIG. 5 indicates a cap for closing the upper opening of the insertion hole 13, and the cap 28 is made of an elastic body such as rubber.

The obturator A shown in the embodiment has the above-mentioned structure, and when the suspension hole 2 is closed, the nipping piece 24 is first moved in the state where both ends of the nipping piece 24 face below the protrusion 12. Then, the manhole cover 1 shown in FIG. 3 is inserted into the suspension hole 2 from above.

FIG. 3 shows a state in which the obturator A is inserted into the suspension hole 2, the flange 11 is supported by the upper surface of the manhole cover 1, and the protrusion 12 is inserted into the groove 4 of the suspension hole 2. There is. Further, the sandwiching piece 24 is located below the lower surface of the manhole cover 1.

In the inserted state of the obturator A as described above, the handle shaft 19 of the rotary operation tool 18 is inserted into the insertion hole 13 and the engagement piece 21 at the lower end is inserted into the torque engagement portion 2 of the operation shaft 14.
When the operation shaft 14 is rotated in the direction in which the screw 23 is engaged with the operation handle 20 and the screw 23 is screwed into the sandwiching piece 24 by the operation of the handle 20, the sandwiching piece 24 rotates together with the operation shaft 14 in the initial rotation of the operating shaft 14. And contacts one side of the stopper piece 26.

At this time, both ends of the sandwiching piece 24 are displaced by 90 ° in the circumferential direction with respect to the groove 4 of the suspension hole 2, and when the operating shaft 14 is further rotated from that state, the stopper piece 26 is formed.
The holding piece 24, which is prevented from rotating by the above, moves upward along the side edge of the stopper piece 26, and as shown in FIGS. 4 and 5, both ends of the holding piece 24 and the flange 25 move the manhole cover 1 up and down. Is pinched from. Obturator A due to the clamping
Is in an attached state, and the flange 11 suspends the suspension hole 2
Is closed.

After the suspension of the suspension hole 2, as shown in FIG. 2, a cap 28 is attached to the upper opening of the insertion hole 13 to prevent the operation shaft 14 from being unnecessarily rotated.

When opening the hanging hole 2, the cap 28 shown in FIG. 5 is removed, and the operation shaft 14 is rotated in the reverse direction by operating the handle 20 of the rotary operation tool 18 inserted into the insertion hole 13. When the operation shaft 14 rotates, the operation piece 14 descends while rotating along the inclined cam edge 27, separates from the lower surface of the manhole cover 1, and abuts on the stopper piece 26, and descends along the side edge of the stopper 26. To do. At this time, both ends of the stopper piece 26 are in a state of facing the lower part of the protruding portion 12, and by pulling up the obturator A, the holding piece 24 passes through the hanging hole 2 and is located above the manhole cover 1. Can be removed.

[0025]

As described above, according to the present invention, the obturator can be attached by the simple operation of rotating the operation shaft after inserting the shaft into the suspension hole of the manhole cover, and the attachment state thereof. Since the holding piece and the flange hold the manhole cover, the obturator can be securely attached.

Since the hanging hole is closed by the flange by attaching the obturator, it is possible to prevent the manhole lid from being unnecessarily opened by using the hanging hole.

Further, since the cap is detachably attached to the upper part of the insertion hole, it is possible to prevent the operation shaft from being unnecessarily rotated and at the same time, foreign matter such as sand or dust enters the insertion hole. Can be prevented.

[Brief description of drawings]

FIG. 1 is a partially cutaway exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a sectional view of the same obturator.

FIG. 3 (I) is a sectional view of the same obstruction device inserted into a suspension hole of a manhole cover, and (II) is a bottom view of (I).

FIG. 4 (I) is a sectional view showing a mounting state of the obturator,
(I) is the bottom view of (I)

FIG. 5 is a sectional view showing a state in which a cap is attached to the insertion hole of the same obturator.

[Explanation of symbols]

 1 Manhole Cover 2 Suspension Hole 3 Circular Hole 4 Groove 10 Shaft Body 11 Flange 12 Projection 13 Insertion Hole 14 Operation Axis 18 Rotating Operation Tool 22 Torque Engagement Part 23 Screw 24 Clamping Piece 26 Stopper Piece 28 Cap

Claims (1)

[Claims] 1. A suspension hole provided in a manhole cover,
In the obturator which comprises a circular hole and a pair of grooves provided on the inner circumference of the circular hole and closes the hanging hole, the hanging hole can be covered on the upper end of the shaft body insertable into the circular hole. A flange having a size is provided, a protruding portion that can be inserted into the engagement groove is provided on the outer peripheral upper portion of the shaft body, and the operation shaft is inserted into an insertion hole provided on the central axis of the shaft body so as to be rotatably supported. A torque engaging portion with which the rotary operation tool can be engaged is provided at the upper end located in the insertion hole of the operating shaft, and a screw is provided on the outer periphery of the lower end of the operating shaft projecting downward from the lower surface of the shaft body. A holding piece insertable into the hanging hole is screw-engaged with the shaft body at a position where both ends of the holding piece face below the protrusion on the lower surface of the shaft body, and a position rotated from the position by a set angle. A stopper piece is provided to prevent the clamping piece from rotating, and a cap is detachably attached to the upper part of the insertion hole. Obturator hanging holes of the manhole cover, characterized in that digit.